CN1048762A - 光磁录音放音机 - Google Patents

光磁录音放音机 Download PDF

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Publication number
CN1048762A
CN1048762A CN90104613A CN90104613A CN1048762A CN 1048762 A CN1048762 A CN 1048762A CN 90104613 A CN90104613 A CN 90104613A CN 90104613 A CN90104613 A CN 90104613A CN 1048762 A CN1048762 A CN 1048762A
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Prior art keywords
magneto
laser instrument
optical recording
signal
wavelength
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CN90104613A
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CN1021492C (zh
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默里莫托·亚苏阿基
楚克尔·弗里德海尔曼
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Deutsche Thomson Brandt GmbH
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Deutsche Thomson Brandt GmbH
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/1055—Disposition or mounting of transducers relative to record carriers
    • G11B11/10576—Disposition or mounting of transducers relative to record carriers with provision for moving the transducers for maintaining alignment or spacing relative to the carrier
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10595—Control of operating function
    • G11B11/10597—Adaptations for transducing various formats on the same or different carriers

Abstract

(1)光磁录音放音机。
(2.1)一种光磁录音放音机，它确保同时读取贮 存于片槽和光磁膜之信息而不串音干扰。
(2.2)为排除两信号相互干扰，第一激光器(1)用 于扫描片槽，其波长λ1约四倍于槽深；第二激光器 (10)用于读取光磁模中之信息，其波长λ2约二倍于 槽深。
(2.3)光磁记录重放仪。
(3)图1。

Description

本发明涉及一种储存信息不仅借助于所谓片槽还有光磁膜的录音载体的光磁录音放音机。
这种光磁录放机不仅反应能读取片槽中的信息而且还要读取光磁膜上的信息，所以得注意这二种信号不能相互干扰例如串音混杂。
本发明之任务在于按照权利要求1设计一种光磁录音放音机，它能同时读取上述二种方式储存的信息并确保这二种信号互不影响。
本发明采用如下途径实现上述任务：第一激光器作扫描片槽之用并选择该激光器之波长约为槽深的四倍。第二激光器用于读取光磁膜上储有的信息并选择等于槽深2倍之波长。
图1为本发明实施示意图。
图2与图3为推挽信号。
图4为光磁唱片的剖面图。
选择第一激光器波长λ1是槽深的四倍则光路长为λ1/2。
象普通的CD一唱片情况一样，片槽调节来自第一激光器的光波，这样就能从其反射光中获取储存于片槽中的信息。
由于选择第二激光器波长二倍于槽深，光路长恰为λ2片槽并不调节第二激光器的光波。发自第二激光器光波之偏振面仅根据录音载体之光磁膜中所储存的信息左右转动，所以第二激光器的光波只能传送光磁膜上的信息。
在第二激光器上设计可调激光器是十分有利的。它发射出的光波被录音载体反射到一个分为二部分的光传感器上。为了使第二激光器的波长自动调节到最佳值，通过该光传感器对其二个输出端信号求差产生一推挽信号。从第二激光器光波中获取的这个信号相位将与另一个信号之相位对比。该对比信号以同样的方式从第一激光器光波中获取，即为惯常产生的跟踪误差信号。在同相或反相位置上第二激光器的波长过大或过小。只有当推挽信号为零时，第二激光器才被调节到合适的波长。
为自动调节第二激光器波长，把第二激光器的推挽信号和第一激光器的跟踪误差信号一起输入一个乘法器，它的输出端经过一个低通滤波器与一伺服放大器连接。在伺服放大器的输出端便可得到第二激光器的调节信号。
下面借助图1阐述本发明。
第一激光器（1）的光束穿过准直透镜（2）、光栅（3）、棱镜分光镜（4）、双向色镜（5）、偏振分光镜（6）和物透镜（7）照射到录音载体（8）上，载体（8）其后设置磁记录仪（21）。第二可调激光器（10）的光束从侧面穿过准直透镜（9）照射到偏振分光镜（6）上，镜（6）将该光束呈直角转向，使它也照射到录音载体（8）上。录音载体（8）又将第二激光器（10）的光反射，穿过物透镜（7）和偏振分光镜（6）反射到双向色镜（5），镜（5）又将其垂直折射到凸透镜（11）上，镜（11）后有一偏振分光镜（12），于是，光束的一部分从偏振分光镜（12）垂直折射到光传感器（14）上;光束的另一部分穿过该偏振分光镜（12）直射到双分光传感器（13）上。（13）的两个输出端与差分放大器的输入端连接。由双分光传感器（13）的二个输出信号13a和13b差分放大器产生推挽信号Ps：
Ps＝13a-13b
借助加法器和减法器获得光磁信息信号Mo为
MO＝14a-13a-13b
式中14a为光传感器（14）的输出信号。
从第一激光器射出的光束从录音载体（8）经反射穿过物透镜（7）、偏振分光镜（6）和双向色镜（5）至棱镜分光镜（4），镜（4）又将其垂直折射到后面置有柱镜16的凸透镜（15）上，第一激光器的这束反射光又从柱镜（16）照射到具有A、B、C、D四个象限的四象限光传感器以及另外二个光传感器E和F上。信息信号OS和焦差信号FE其构成通常为
OS＝AS+BS+CS+DS
FE＝AS+CS-BS-DS
式中AS、BS、CS、DS分别为四个象限A、B、C、D的输出信号。光传感器E和F与产生跟踪误差信号TE的差分放大器（23）的输入端相连接。
TE＝ES-FS
式中ES和FS为两个光传感器E和F的输出信号。差分放大器（22）和另一差分放大器23的各自的输出端分别与乘法器（18）的两个输入端连接，乘法器（18）的输出端经过低通滤波器（19）与伺服放大器（20）连接。伺服放大器（20）的输出端再接到可调激光器（10）的控制输入端上。
图2所示是可调激光器（10）光波波长过大情况下给出的推挽信号，而图3所示是波长过小时的推挽信号。由于可调激光器（10）的波长是自动调节的，片槽深度不再起作用，所以可扫描具有不同槽深的唱片。
图4为唱片的剖面图，具有片槽P的基层上有一光磁膜M。

Claims (5)

1、用于一种录音载体(8)其信息储存不仅借助其所谓的片槽而且还有其光磁膜的光磁录音放音机，其特征在于选择第一激光器(1)约四倍于槽深之波长λ1扫描片槽；选择第二激光器(10)波长λ2约二倍于槽深用于读取贮于光磁膜中之信息。
2、根据权利要求1所述之光磁录音放音机，其特征在于其第二激光器是可调的。
3、根据权利要求2所述之光磁录音放音机，其特征在于第二可调激光器经以下途径自动调节至合适的波长：由第二激光器发出的光由录音载体反射到双分光电检波器（13）上并由其二个输出信号（13a、13b）的差值产生推挽信号Ps，由此获得可调激光器（10）的调节信号。
4、根据权利要求3所述之光磁录音放音机，其特征在于对比推挽信号（Ps）的位相与第一激光器产生的跟踪误差信号之位相，并由此位相对比中获得第二激光器（10）波长λ2的调节信号。
5、根据权利要求4所述之光磁录音放音机，其特征在于双分光传感器（13）的输出端与差分放大器（22）的输入端连接，差分放大器（22）的输出端与乘法器（18）的一个输入端连接，乘法器（18）的另一个输入端引入跟踪误差信号（TE），该信号通常由二个光电检波器（E、F）和差分放大器（23）产生。乘法器（18）的输出端经低通滤波器（19）与伺服放大器（20）的输入端连接，该伺服放大器的输出端再接到可调激光器（10）的控制输入端。
CN90104613A 1989-07-14 1990-07-14 光磁录音放音机 Expired - Fee Related CN1021492C (zh)

Applications Claiming Priority (2)

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DEP3923328.6 1989-07-14
DE3923328A DE3923328A1 (de) 1989-07-14 1989-07-14 Magneto-optisches aufnahme- und/oder wiedergabegeraet

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CN1048762A true CN1048762A (zh) 1991-01-23
CN1021492C CN1021492C (zh) 1993-06-30

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US (1) US5375109A (zh)
EP (1) EP0485448B1 (zh)
JP (1) JP3112087B2 (zh)
KR (1) KR0168456B1 (zh)
CN (1) CN1021492C (zh)
AT (1) ATE107790T1 (zh)
AU (1) AU6060090A (zh)
DD (1) DD296774A5 (zh)
DE (2) DE3923328A1 (zh)
ES (1) ES2056473T3 (zh)
FI (1) FI920143A0 (zh)
HK (1) HK108095A (zh)
HU (1) HUT60561A (zh)
MY (1) MY106015A (zh)
WO (1) WO1991001553A1 (zh)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3923328A1 (de) * 1989-07-14 1991-01-24 Thomson Brandt Gmbh Magneto-optisches aufnahme- und/oder wiedergabegeraet
JP3095871B2 (ja) * 1992-04-09 2000-10-10 パイオニア株式会社 光学式ディスクおよびその情報再生方法
JPH0668599U (ja) * 1993-03-12 1994-09-27 株式会社イナックス トイレ設備
US5696750A (en) * 1995-06-05 1997-12-09 Nec Corporation Optical head apparatus for different types of disks
US5756038A (en) * 1996-04-01 1998-05-26 Seda Specialty Packaging Corp. Process of reshaping decorated plastic materials

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6113458A (ja) * 1984-06-29 1986-01-21 Hitachi Ltd 光学的情報記録媒体およびカツテイング装置
JPS6142738A (ja) * 1984-08-06 1986-03-01 Hikari Yokoekawa 光学式記録再生システム
JPS6151631A (ja) * 1984-08-20 1986-03-14 Sharp Corp 光磁気メモリ素子
NL8500153A (nl) * 1985-01-22 1986-08-18 Philips Nv Registratiedragerlichaam voorzien van een reliefstruktuur van optisch detekteerbare servospoorgedeelten en sektoradressen en inrichting voor het aanbrengen van deze struktuur.
JPS61206436A (ja) * 1985-03-08 1986-09-12 旭光学工業株式会社 レ−ザ−メス装置
JPS61206947A (ja) * 1985-03-11 1986-09-13 Nippon Kogaku Kk <Nikon> 同時消録型光磁気記録及び記録再生装置のピツクアツプ
DE3732874A1 (de) * 1987-09-30 1989-04-20 Thomson Brandt Gmbh Optische abtastvorrichtung
NL8800133A (nl) * 1988-01-21 1989-08-16 Philips Nv Inrichting voor het met optische straling aftasten van een informatievlak.
DE3923328A1 (de) * 1989-07-14 1991-01-24 Thomson Brandt Gmbh Magneto-optisches aufnahme- und/oder wiedergabegeraet
JP2870127B2 (ja) * 1990-05-31 1999-03-10 ソニー株式会社 トラッキング制御方法

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ES2056473T3 (es) 1994-10-01
KR0168456B1 (ko) 1999-03-20
HUT60561A (en) 1992-09-28
HK108095A (en) 1995-07-14
KR920702529A (ko) 1992-09-04
AU6060090A (en) 1991-02-22
EP0485448B1 (de) 1994-06-22
DD296774A5 (de) 1991-12-12
EP0485448A1 (de) 1992-05-20
DE3923328A1 (de) 1991-01-24
MY106015A (en) 1995-02-28
JPH04506722A (ja) 1992-11-19
US5375109A (en) 1994-12-20
DE59006249D1 (de) 1994-07-28
WO1991001553A1 (de) 1991-02-07
JP3112087B2 (ja) 2000-11-27
HU9200017D0 (en) 1992-04-28
FI920143A0 (fi) 1992-01-13
CN1021492C (zh) 1993-06-30
ATE107790T1 (de) 1994-07-15

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